Giant configurational softening controls atomic-level process of shear banding in metallic glasses

doi:10.1103/PhysRevMaterials.5.123602

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Giant configurational softening controls atomic-level process of shear banding in metallic glasses
	Yang ZY(杨增宇)2,3; Dai LH(戴兰宏)1,2,3
刊名	PHYSICAL REVIEW MATERIALS
	2021-12-06
卷号	5 期号:12 页码:8
ISSN号	2475-9953
DOI	10.1103/PhysRevMaterials.5.123602
通讯作者	Dai, Lan-Hong(lhdai@lnm.imech.ac.cn)
英文摘要	While the shear banding is a ubiquitous feature for metallic glasses and other disordered solids, the underlying material softening mechanism is still an open question requiring physical interpretation at atomic level. Here, through a set of atomistic simulations, we clarify the origin of flow localization, i.e., the birth of a shear band. The local thermal temperature induced by atomic vibration and configurational temperature attributed to structural disordering are proposed to quantify critical degree of thermal and configurational softening, respectively. The comparison between configurational softening and thermal softening being two potential causes for shear banding emergence is then examined at atomic scale. Numerical evidence from atomistic simulations indicates that configurational-softening-induced strain burst is the dominant instability mode as evidenced through a very large value of configurational temperature rise that commensurate with glass transition temperature. It is also found that configurational softening takes precedence over thermally activated ones. Configurational softening is thus conceivably acting as the root cause for the onset of strain localization and shear banding, while the subsequent thermal softening is its consequence. These results provide important insights into the puzzle about the material weakening mechanism underlying shear banding.
分类号	二类
资助项目	NSFC Basic Science Center Program for Multiscale Problems in Non-linear Mechanics[11988102] ; NSFC[11790292] ; National Key Research and Development Program of China[2017YFB0702003] ; Strategic Priority Research Program[XDB22040302] ; Strategic Priority Research Program[XDB22040303] ; Key Research Program of Frontier Sciences[QYZDJSSW-JSC011]
WOS关键词	PLASTIC-FLOW ; DEFORMATION ; DYNAMICS ; SIMULATION ; ORDER
WOS研究方向	Materials Science
语种	英语
WOS记录号	WOS:000729195800004
资助机构	NSFC Basic Science Center Program for Multiscale Problems in Non-linear Mechanics ; NSFC ; National Key Research and Development Program of China ; Strategic Priority Research Program ; Key Research Program of Frontier Sciences
其他责任者	Dai, Lan-Hong
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/87972]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Univ Chinese Acad Sci, Sch Future Technol, Beijing 100049, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China;
推荐引用方式 GB/T 7714	Yang ZY,Dai LH. Giant configurational softening controls atomic-level process of shear banding in metallic glasses[J]. PHYSICAL REVIEW MATERIALS,2021,5(12):8.
APA	杨增宇,&戴兰宏.(2021).Giant configurational softening controls atomic-level process of shear banding in metallic glasses.PHYSICAL REVIEW MATERIALS,5(12),8.
MLA	杨增宇,et al."Giant configurational softening controls atomic-level process of shear banding in metallic glasses".PHYSICAL REVIEW MATERIALS 5.12(2021):8.